This ERC introduces a new wallet RPC, wallet_addSubAccount, which allows an app to request a wallet to track a smart account that the wallet owns. It also allows apps to request the wallet to provision a new account, owned by the universal wallet with a signer provided by the caller.
Embedded app accounts (onchain accounts specific to a single app) have led to a proliferation of user addresses, which can be difficult for users to keep track of. Many embedded app account users also have a universal wallet, which can be used across apps. With hierarchical ownershipâwhere one smart account can own anotherâif the embedded app account is a smart account, it could be owned by the userâs universal wallet. This would allow users to be able to control an app account via their universal wallet. However, though hierarchical ownership is already possible today, there is no way for apps to tell universal wallets about embedded app accounts a user may have. The proposed RPC provides a path for this.